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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bddc78a26740d749259e76a28ea46ef6a192beba7a072f2467b8dd0a50393043' 
  AND token = 'QTuT05KPnkehHtUXK5ItFm88IY+h8ssVBo2stl7eb6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}